Verifying that a string contains only letters in C#

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Only letters: 

Regex.IsMatch(input, @"^[a-zA-Z]+$");

Only letters and numbers: 

Regex.IsMatch(input, @"^[a-zA-Z0-9]+$");

Only letters, numbers and underscore: 

Regex.IsMatch(input, @"^[a-zA-Z0-9_]+$");

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